IMX6SDLCEC datasheet(85/169 Pages) NXP

85 / 169 page

Electrical Characteristics

i.MX 6Solo/6DualLite Applications Processors for Consumer Products, Rev. 9, 11/2018

NXP Semiconductors

4.11.5.2

RMII Mode Timing

In RMII mode, ENET_CLK is used as the REF_CLK, which is a 50 MHz ± 50 ppm continuous reference

clock. ENET_RX_EN is used as the ENET_RX_EN in RMII. Other signals under RMII mode include

ENET_TX_EN, ENET_TX_DATA[1:0], ENET_RX_DATA[1:0] and ENET_RX_ER.

Figure 47 shows RMII mode timings. Table 59 describes the timing parameters (M16–M21) shown in the

figure.

Figure 47. RMII Mode Signal Timing Diagram

4.11.5.3

Signal Switching Specifications

The following timing specifications meet the requirements for RGMII interfaces for a range of transceiver

devices.

Table 59. RMII Signal Timing

Characteristic

Min

Max

Unit

M16

ENET_CLK pulse width high

35%

65%

ENET_CLK period

M17

ENET_CLK pulse width low

35%

65%

ENET_CLK period

M18

ENET_CLK to ENET0_TXD[1:0], ENET_TX_DATA invalid

—

M19

ENET_CLK to ENET0_TXD[1:0], ENET_TX_DATA valid

—

M20

ENET_RX_DATAD[1:0], ENET_RX_EN(ENET_RX_EN), ENET_RX_ER to

ENET_CLK setup

4—

M21

ENET_CLK to ENET_RX_DATAD[1:0], ENET_RX_EN, ENET_RX_ER hold

—

ENET_CLK (input)

ENET_TX_EN

M16

M17

M18

M19

M20

M21

ENET_RX_DATA[1:0]

ENET_TX_DATA (output)

ENET_RX_ER

ENET_RX_EN (input)

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